|Assembling a World-Class
Unity was constructed at the Marshall Space Flight Center in Huntsville, Ala., and shipped in June of 1997 to the Kennedy Space Center launch site for final assembly and launch preparations.
Unity has six berthing ports, one on each side, to which future modules will be attached. With the two mating adapters attached, it weighs about 25,350 pounds and is 33 feet long and 15 feet in diameter.
In a circular orbit about 240 statute miles above the surface of the Earth, Endeavour, with Unity upright in its cargo bay, will capture Zarya and attach the two initial elements to one another before releasing both to await subsequent space station elements.